basic principals of inrush current limiting

Protection DevicesInrush Current Limiting NTCs

EPCOS AG A Group Company of TDK-EPC Corporation PPD PD VAR PM Munich, Germany Feb 2010

Protection devicesMajor applications Overload protection Telecom line protection Surge voltage protection at Telecom installations and AC lines PTC relays for compressors start LED current regulation Heating elements Surge arresters PTC elements Disk varistors ICLs Inrush current limiting

Protection Devices: ICL Basis

TDK-EPC Corporation 2010 PPD PD VAR PM 01/10 2

ICLs - The Safe Start

Inrush Current Limiters from EPCOS. A safe and reliable protection for capacitive loads in switching circuits and for soft starting of inductive loads. TDK-EPC Corporation 2010 PPD PD VAR PM 01/10 3


Principle of ICL-NTCs

R

TResistance / Temperature Curve Typical load current characteristic



ICL - Inrush Current LimitingReducing of inrush current in order ... Inrush Current Limiting in

to reduce the peaks in the circuit to protect other components to avoid tripping of fuses to reduce PCB size compared to fixed resistors

Switched Mode Power Supplies Soft Start of Electric Motors Halogen Lamps Fluorescent Lamps Transformers



ICL Advantages Wide product range 12 various ceramic systems Rated resistance(25 : 1 up to 80 [ohm] C) Max. permissible current : 1.3 up to 20.0 [A] No current derating in the range of 0 to 65 C (except S237) High reliability Tested according to IEC 60068 (dry heat, damp heat, rapid temperature cycling) Endurance, pulse strength are proved. UL approval (E69802) Inside- and outside kink lead are also available (Inline kink lead is standard.)



ICL Product FamiliesSeries B57153S B57235S B57236S B57237S B57238S B57364S B57464S 0.1 1.0 10.0 100.0 Ohm



ICLs: Structure and PrincipleR

TR/T characteristics of a NTC

Sintering various oxide together with other additives produces a polycrystalline, semi-conductive, temperature depending ceramic. This phenomenon results in a Negative Coefficient Thermistor (NTC)



Circuit PrincipleThe ICL is placed in series with the load before the capacitive or inductive load. The NTC thermistors specifically developed for this application limit the current at turn-on by their relatively high cold resistance. As a result of the current load the thermistor heats up and reduces its resistance. Hence the ICL provides protection from undesirable high inrush currents but features low power consumption during continuous operation.Protection Devices: ICL Basis TDK-EPC Corporation 2010 PPD PD VAR PM 01/10 9

Principle of ICL-NTCs

The thermal properties of a Power NTC can be used to limit harmful switch-on currents of capacitive loads. At turn-on the NTC restricts the current flow into the capacitor due to its `cold` resistance. The current flowing through the NTC causes it to self heat and thereby reducing its resistance by a factor 10 to 50.



Load Derating of ICLs

Derating curve for maximum permissible continuous current vs ambient temperature



Circuit Examples

Typical Power Supply (Line Line)Input protected by Varistor against over-voltages. Capacitor protected against inrush-currents by an ICL. Load fuse additionally used to protect the Varistor against thermal runaway.

~

Varistor ICLProtection Devices: ICL Basis TDK-EPC Corporation 2010 PPD PD VAR PM 01/10 13

Power Supply with Relay (Line-Line)Sensing circuit shorts-out the ICL when the capacitor has reached a predetermined voltage i.e. 95% of charge..

~Varistor ICLProtection Devices: ICL Basis TDK-EPC Corporation 2010 PPD PD VAR PM 01/10 14

Protection of Drives and Invertors

Mains

Rectifier

Inverter

Motor M

DC-Link

Block Varistors protect each phase of Drive ICLs protect the Capacitors



Fields of Application

Disks in Entertainment ElectronicsA guideline for the selection of types for this application.

VAR

ICL

S05 S20, ETFV, SFS 175V / 275V S153, S236, S237 4.7 / 10.0 Ohm



Disks in Consumer Electronics

A guideline for the selection of types for this application.

VAR ICL

S05 S20, 275V / 300V S153 S364



Disks in Power Supplies

SMPS / UMPS

Compressor

Energy-Meter

Varistors S++K175 / 275 (E2) SFS; ETFV ICL S153; S235;S236Protection Devices: ICL Basis

Varistors S++K175 - 420 (E2) SFS; ETFV ICL S153;S235;S236

Varistors S10K385 / 420 / 510 (E2) S14K385 / 420 / 510 (E2) S20K385 / 420 / 510 (E2)


www.tdk.co.jp www.epcos.com

basic principals of inrush current limiting

Documents

NTC thermistors for inrush current limiting - mouser.de fileApplications For peripheral communication equipment, e.g. in swich-mode power supplies Features Black coated thermistor

NTC Thermistor Cataloguekonkurel.ru/thinking/en-sck.pdf · 2018. 3. 22. · NTC Thermistor：SCK Series Power Thermistor for Limiting Inrush Current THINKING ELECTRONIC INDUSTRIAL

NTC Thermistor Catalogue - thinking.com.tw · NTC Thermistor：SCK Series Power Thermistor for Limiting Inrush Current A THINKING ELECTRONIC INDUSTRIAL CO., LTD. 10 2018.05 All specifications

NTC thermistors for inrush current limiting · 2019-10-13 · 1) For details on the capacitance Ctest please refer to "Application notes", chapter 1.6. Applications Inrush current

NTC thermistors for inrush current limiting

NTC thermistors for inrush current limiting -TDK-/B57234S509M51.pdfNTC thermistors for inrush current limiting Inrush Current ... at 230 V AC at 110 V AC (at Imax, 25 ... the NTC thermistor

Project E1.06 –Transformer Inrush Limiting Device (TILD ...c847edf6-0e8a-4be2-9806-b4a37b05f69b/E1.06.pdfProject Description Approach Aggreko Facility and TILD Diagrams Project E1.06

NTC thermistors for inrush current limiting · The capacitor Ctest is discharged via the series resistor RS and the NTC inrush current limiter. The load voltage is chosen such that

NTC Power Thermistor for SCK Series Limiting Inrush ... · NTC Power Thermistor for Limiting Inrush Current RoHS MERITEK SCK Series FEATURES Body size: Ф5mm ~ Ф30mm Radial lead

Generation and Control of Transient Overvoltages in Power … · 2019-10-21 · Key Words: Capacitor bank switching (CBS), current limiting reactor, Harmonic analysis, Inrush current,

Sympathetic Inrush

PDI WaveStar Static Transfer Switch - CM Buckcmbuck.com/.../Power-Distribution-Low-Inrush-Transfer-Algorithms.pdfOne of the limiting factors in applying static transfer switch-es (STS)

Análisis de la corriente Inrush y Sympathetic Inrush en

NTC Thermistor Catalogue - Thinking · NTC Thermistor：SCK Series Power Thermistor for Limiting Inrush Current A THINKING ELECTRONIC INDUSTRIAL CO., LTD. 10 2018.05 All specifications

NTC thermistors for inrush current limiting › ... › 50 › db › icl_16 › S364.pdf1 Soldering 1.1 Leaded NTC thermistors Leaded thermistors comply with the solderability requirements

NTC thermistors for inrush current limiting - EPCOS · NTC thermistors for inrush current limiting Leaded and coated disks, P11 series ... II P11, P13 1500 500 max. 23 ±1 approx

SL40.300/.301 CB - PULS · 2019-03-14 · Input current 3.0 A Inrush current < 30 A Inrush current limiting done with a fixed 23R resistor (not a thermistor) which is bridged after

NTC thermistors for inrush current limiting · Inrush current limiting, e.g. in switch-mode power supplies, soft-start motors Features Leaded and coated NTC thermistors Tinned copper

Inrush Paralelo

Amphenol Embedded Sensor Technologies for Transportation, … · 2016-08-30 · • NTC & PTC thermistors • Non-contact Infrared temperature sensors • Inrush current limiting

current inrush avoider for toroidal-transformers inrush avoider for toroidal-transformers info ... The inrush current of the transformers is 10 times ... current inrush avoider for

NTC thermistors for inrush current limiting · PDF fileNTC thermistors for inrush current limiting Leaded and coated disks ... Switch-mode power supplies ... Please read Cautions and

NTC thermistors for inrush current limiting - en.tdk.eu · NTC thermistors for inrush current limiting Leaded and coated disks, P11 series ... II P11, P13 1500 500 max. 23 ±1 approx

NTC thermistors for inrush current limiting · inrush current limiting Leaded and coated disks Series/Type: B57235S0*M0 Date: October 2013 ... 5 4.2 200 800 0.110 B57235S0509M0**

NTC thermistors for inrush current limiting · 2016. 11. 16. · Applications Inrush current limiting, e.g. in switch-mode power supplies, soft-start motors Features Leaded and coated

NTC thermistors for inrush current limiting - …radiocom.dn.ua/image/data/pdf/B57211P0_Epcos.pdf · NTC thermistors for inrush current limiting Leaded and coated disks, ... 12 4.0

Medical World wide Cost Safety EMI Inrush WMA Effective ...€¦ · WMA-series Cost Effective World wide Safety Approvals EMI Inrush current limiting OCP Eý+k#w Ú µ OVP Eý+k Á

NTC Thermistor SCK Series - Welcome .::. … · NTC Thermistor：SCK Series Power Thermistor for Limiting Inrush Current All specifications are subject to change without notice. Electrical

Active Inrush Current Limiting Using MOSFETs

NTC thermistors for inrush current limiting...Applications Inrush current limiting, e.g. in switch-mode power supplies, soft-start motors Features Leaded and coated NTC thermistors

Inrush Current Analysis for Switching Large Shunt ...cld.persiangig.com/dl/jeWWP/6mVWD0Fvdx/10.1109... · of parameters such as sizing of current limiting reactor (CLR), pre-insert

NTC thermistors for inrush current limiting · Application notes The following two important aspects for determining the right NTC inrush current limiter are excerpted from the chapter

Transformer Inrush and Voltage Sag P28 Studiessp-eng.co.uk/wp-content/.../SPE-Transformer-Inrush...Transformer Inrush –Overview Continued •The magnitude of the inrush current and

Limiting Inrush Current with NTC and PTC Thermistors

NTC Thermistor：：：：SCK Series · 2011-08-18 · NTC Thermistor：：：：SCK Series Power Thermistor for Limiting Inrush Current 1 2011.02 All specifications are subject to